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February 26, 2015

February 26, 2015

Posted by **jansa** on Thursday, May 5, 2011 at 5:48pm.

What is the probability that the sample mean will have a value between 45 and 55?

What is the probability that the sample mean will have a value between 48 and 52?

What range of values has a 95% probability of containing the sample mean?

- statistics -
**PsyDAG**, Friday, May 6, 2011 at 2:09pmZ = (score-mean)/SEm (Standard Error of the mean)

SEm = SD/√(n-1) (You can use n)

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the various Z scores.

95% = mean ± 1.96 SEm

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